A plant’s metabolism still needs to function even when the sun isn’t shining. So they consume oxygen at night, in their roots, etc. This is most apparent for

A plant’s metabolism still needs to function even when the sun isn’t shining. So they consume oxygen at night, in their roots, etc. This is most apparent for the occasional parasitic plant without chlorophyll. https://en.wikipedia.org/wiki/Albino_redwood https://en.wikipedia.org/wiki/Albino_redwood